A broad range of materials constitute the construction and demolition stream. It includes anything used in the construction of roads, bridges and buildings—concrete, asphalt, wood, drywall, asphalt shingles, metals, plastics, vinyl, carpet, ceiling tiles, and cardboard are the most common materials generated. According to the CDRA, more than 583 million tons of C&D debris were generated in 2015. There are opportunities and challenges to recycling any of these into usable end products. In the sections below is information on each of these major material segments.